selectbox value set option value 0 then set valueNotEquals:"0" date formate set dateFormat: true and it validation of dd-mm-yyyy formateprice we can to set as decimal float_number: truephone if we want to set +91-10degits then set indiaPhone: true

Here Example of Facebook Login With Javascript SDKthe login flow step-by-step and explain
each step clearly - this will help you if you are trying to integrate
Facebook Login into an existing login system, or just to integrate it
with any server-side code you're running. But before we do that, it's
worth showing how little code is required to implement login in a web
application using the JavaScript SDK.

include , require and require_once , include_once in php

include, require and require_once,include_once are used to include a file into the PHP code

forexample of include and require

<h1>Welcome to My blog!</h1>
<?php include 'header.php';?>

itcan addedfile in php code.

in require example

<h1>Welcome to My blog!</h1><?phprequire'header.php';?>

difference between include and require

when a
file is included with the include statement and PHP cannot find it, the script
will continue to execute

and

the
echo statement will not be executed because the script execution dies after the
require statement returned a fatal error

include_once

It can be used include a PHP file another one, it can used to add files once. If it is found that the file has already been included, calling script is going to
ignore further inclusions.

Syntax

include_once('name of the called file with path');example<?php include_once('xyz.php'); ?>same as require_once used.<?phprequire_once('example.php') ?>include_once and require_once same different with include and require.